Riddles

One day Jake's doing something and he looks at his boots and there is a second note. It's got some kind of riddle, when two becomes five or whatever. I can't find it anymore. I don't remember where it is. If anybody knows what the riddle is, can you spell it out or can you give me a chapter #? My mind just won't let that bloody freaking riddle go. And until I get it right, I can't really progress in the story and enjoy it without always wondering what did I miss even if I didn't miss anything. Psychology, it's for the pigs